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STM32F107VB Arkusz danych(PDF) 56 Page - STMicroelectronics

Numer części STM32F107VB
Szczegółowy opis  Connectivity line, ARM-based 32-bit MCU with 64/256 KB Flash, USB OTG, Ethernet, 10 timers, 2 CANs, 2 ADCs, 14 communication interfaces
PDF  95 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
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STM32F107VB Arkusz danych(HTML) 56 Page - STMicroelectronics

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Electrical characteristics
STM32F105xx, STM32F107xx
56/95
Doc ID 15274 Rev 4
Figure 17.
I/O AC characteristics definition
5.3.13
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 35).
Unless otherwise specified, the parameters given in Table 38 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 9.
ai14131
10%
90%
50%
tr(IO)out
OUTPUT
EXT ERNAL
ON 50pF
Maximum fr equency is achieved if (tr + tf) "2/3)T and if the duty cycle is (45-55%)"
10%
50%
90%
when loaded by 50pF
T
tr(IO)out
Table 38.
NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL(NRST)
(1)
1. Guaranteed by design, not tested in production.
NRST Input low level voltage
–0.5
0.8
V
VIH(NRST)
(1)
NRST Input high level voltage
2
VDD+0.5
Vhys(NRST)
NRST Schmitt trigger voltage
hysteresis
200
mV
RPU
Weak pull-up equivalent resistor(2)
2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution
to the series resistance must be minimum
(~10% order)
.
VIN ?"VSS
30
40
50
kY
VF(NRST)
(1)
NRST Input filtered pulse
100
ns
VNF(NRST)
(1)
NRST Input not filtered pulse
VDD > 2.7 V
300
ns



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